Hair dryer



FIG. 1 is a front elevation of a hair dryer showing my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a left side elevation thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The right side view of the design is a mirror image of the left and has not been included. 

The ornamental design for a hair dryer, as shown and described. 